The article introduces a novel strategy to enhance the performance of aqueous zinc-ion batteries (AZIBs) by incorporating urea as an additive in the electrolyte. The authors address the challenges of dendrite formation and water-induced side reactions, which limit the practical applications of AZIBs. By adding urea, the Zn/electrolyte interface is modified, leading to uniform Zn deposition and suppressed side reactions. This modification results in significant improvements in cycling stability and reversibility. Specifically, a Zn/Zn symmetric cell achieved over 2100 hours of long-term cycling stability at high current density and capacity, and a Zn/NH₄V₂O₁₀ full cell demonstrated excellent cycling performance with an average Coulombic efficiency of 99.98%. The study highlights the potential of urea as a low-cost and effective additive for achieving highly reversible AZIBs.The article introduces a novel strategy to enhance the performance of aqueous zinc-ion batteries (AZIBs) by incorporating urea as an additive in the electrolyte. The authors address the challenges of dendrite formation and water-induced side reactions, which limit the practical applications of AZIBs. By adding urea, the Zn/electrolyte interface is modified, leading to uniform Zn deposition and suppressed side reactions. This modification results in significant improvements in cycling stability and reversibility. Specifically, a Zn/Zn symmetric cell achieved over 2100 hours of long-term cycling stability at high current density and capacity, and a Zn/NH₄V₂O₁₀ full cell demonstrated excellent cycling performance with an average Coulombic efficiency of 99.98%. The study highlights the potential of urea as a low-cost and effective additive for achieving highly reversible AZIBs.